[manual] Fetch Handlebars templates using Ajax

...rather than embedding them into index.html.

This is only acceptable for dev, but the next commit adds an alternative
mechanism for prod.

There isn't actually a manual deployment step here.  However, this commit won't
work on staging / prod without the next one (since we don't serve
zephyr/static/templates in prod).

(imported from commit dce7ddfe89e07afc3a96699bb972fd124335aa05)

humbug/settings.py

@@ -174,7 +174,6 @@ INSTALLED_APPS = (
     'django.contrib.staticfiles',
     'south',
     'django_openid_auth',
-    'jstemplate',
     'confirmation',
     'pipeline',
     'zephyr',
@@ -271,6 +270,7 @@ PIPELINE_JS = {
             'js/colorspace.js',
             'js/timerender.js',
             'js/tutorial.js',
+            'js/templates.js',
         ),
         'output_filename': 'min/app.js'
     },